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Windows 7 already includes the .NET Framework 3.5.1 as an OS component. This means you get the .NET Framework 2.0 SP2, 3.0 SP2 and 3.5 SP1 plus a few post 3.5 SP1 bug fixes already integrated. The features of 3.5 SP1 can be added or removed via Control Panel >> Programs and Features >> Turn windows features on or off:

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If you need to repair the .NET Framework 3.5.1 on Windows 7, you will need to use instructions like the ones in this blog post. (Also applies to Windows 7)